How to tile Height Map in blender
You won't be able to scale the bumps with the material settings, as the bumps that we see are real bumps, not procedural bumps. If you want more bumps you need to duplicate x4 your mesh in Edit mode and stick each part (there are several ways to do it but you could simply duplicate and merge the vertice by distance so that the vertices stick, or symmetrize it, etc). You could also bake the real bumps and use the result in a Displace modifier, or in a Displacement node if you want to make it procedural.
A quick way to fake bumps: Plug a Noise Texture into a Bump node. In that case your object can be low-poly (here, one face) as the bump effect doesn't need any geometry.